On U85, both NPU_SET_IFM_BROADCAST and NPU_SET_IFM2_BROADCAST must be
emitted for elementwise operations, matching Vela's GenerateInputBroadcast.
Add calc_broadcast_mode() matching Vela's CalculateBroadcast(): broadcasts
a dimension of shape1 when it is 1 and shape2 is larger, producing a
broadcast_mode bitmask (H=1, W=2, C=4, SCALAR=8).
Split emit_ifm2_broadcast into U65 (legacy bitfields) and U85 paths.
The U85 path emits both IFM_BROADCAST and IFM2_BROADCAST using
calc_broadcast_mode in each direction.
Also fix emit_eltwise to call emit_ifm2_precision instead of
emit_ifm_broadcast for U85, which was emitting 0 instead of the
required IFM2_PRECISION register.
Signed-off-by: Tomeu Vizoso <tomeu@tomeuvizoso.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39611>
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